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. 2020 Jun 4;7:168. doi: 10.1038/s41597-020-0510-y

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© The Author(s) 2020

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Fig. 5 — Temporal trends of harmonized NTL time series from 1992 to 2018 for the sum of NTL DN values and lit pixels using observations with DNs greater than 7 (a,b), 20 (c,d), and 30 (e,f), respectively.